[host@user ~]$ ps --no-headers -Leo user | sort | uniq -c
/etc/security/limits.conf
/etc/security/limits.conf
* soft nproc 400
* hard nproc 200
To set ulimit value on a parameter use the below command.
# ulimit -p [new_value]
For the ulimits to persists across reboots we need to set the ulimit values in the configuration file /etc/security/limits.conf. Settings in /etc/security/limits.conf take the following form:
# vi /etc/security/limits.conf #[domain] [type] [item] [value] * - core [value] * - data [value] * - priority [value] * - fsize [value] * soft sigpending [value] eg:57344 * hard sigpending [value] eg:57444 * - memlock [value] * - nofile [value] eg:1024 * - msgqueue [value] eg:819200 * - locks [value] * soft core [value] * hard nofile [value] @[group] hard nproc [value] [user] soft nproc [value] %[group] hard nproc [value] [user] hard nproc [value] @[group] - maxlogins [value] [user] hard cpu [value] [user] soft cpu [value] [user] hard locks [value]
[domain] can be:
- an user name
- a group name, with @group syntax
- the wildcard *, for default entry
- the wildcard %, can be also used with %group syntax, for maxlogin limit
[type] can have the two values:
- “soft” for enforcing the soft limits
- “hard” for enforcing hard limits
[item] can be one of the following:
- core – limits the core file size (KB)
- data – max data size (KB)
- fsize – maximum filesize (KB)
- memlock – max locked-in-memory address space (KB)
- nofile – max number of open files
- rss – max resident set size (KB)
- stack – max stack size (KB)
- cpu – max CPU time (MIN)
- nproc – max number of processes
- as – address space limit (KB)
- maxlogins – max number of logins for this user
- maxsyslogins – max number of logins on the system
- priority – the priority to run user process with
- locks – max number of file locks the user can hold
- sigpending – max number of pending signals
- msgqueue – max memory used by POSIX message queues (bytes)
- nice – max nice priority allowed to raise to values: [-20, 19]
- rtprio – max realtime priority
src
https://www.thegeekdiary.com/understanding-etc-security-limits-conf-file-to-set-ulimit/
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